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Title: Photon-bunching measurement after two 25-km-long optical fibers

Abstract

To show the feasibility of a long-distance partial Bell-state measurement, a Hong-Ou-Mandel experiment with coherent photons is reported. Pairs of degenerate photons at telecommunication wavelength are created by parametric down-conversion in a periodically poled lithium niobate waveguide. The photon pairs are separated in a beam splitter and transmitted via two fibers of 25 km. The wave packets are relatively delayed and recombined on a second beam splitter, forming a large Mach-Zehnder interferometer. Coincidence counts between the photons at the two output modes are registered. The main challenge consists in the trade-off between low count rates due to narrow filtering and length fluctuations of the 25-km-long arms during the measurement. For balanced paths a Hong-Ou-Mandel dip with a net visibility of 47.3% is observed, which is close to the maximal theoretical value of 50% developed here. This proves the practicability of a long-distance Bell-state measurement with two independent sources, as, e.g., required in an entanglement swapping configuration in the scale of tens of kilometers.

Authors:
; ; ; ; ;  [1]
  1. Group of Applied Physics, University of Geneva, 1211 Geneva 4 (Switzerland)
Publication Date:
OSTI Identifier:
20653292
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 71; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevA.71.042335; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; BEAM SPLITTING; BELL THEOREM; CONVERSION; CORRELATIONS; COUNTING RATES; DATA TRANSMISSION; DISTANCE; ENERGY LEVELS; FLUCTUATIONS; LITHIUM COMPOUNDS; MACH-ZEHNDER INTERFEROMETER; NIOBATES; OPTICAL FIBERS; PERIODICITY; PHOTONS; QUANTUM MECHANICS; VISIBLE RADIATION; WAVE PACKETS; WAVEGUIDES; WAVELENGTHS

Citation Formats

Halder, M, Tanzilli, S, Riedmatten, H de, Beveratos, A, Zbinden, H, and Gisin, N. Photon-bunching measurement after two 25-km-long optical fibers. United States: N. p., 2005. Web. doi:10.1103/PhysRevA.71.042335.
Halder, M, Tanzilli, S, Riedmatten, H de, Beveratos, A, Zbinden, H, & Gisin, N. Photon-bunching measurement after two 25-km-long optical fibers. United States. https://doi.org/10.1103/PhysRevA.71.042335
Halder, M, Tanzilli, S, Riedmatten, H de, Beveratos, A, Zbinden, H, and Gisin, N. Fri . "Photon-bunching measurement after two 25-km-long optical fibers". United States. https://doi.org/10.1103/PhysRevA.71.042335.
@article{osti_20653292,
title = {Photon-bunching measurement after two 25-km-long optical fibers},
author = {Halder, M and Tanzilli, S and Riedmatten, H de and Beveratos, A and Zbinden, H and Gisin, N},
abstractNote = {To show the feasibility of a long-distance partial Bell-state measurement, a Hong-Ou-Mandel experiment with coherent photons is reported. Pairs of degenerate photons at telecommunication wavelength are created by parametric down-conversion in a periodically poled lithium niobate waveguide. The photon pairs are separated in a beam splitter and transmitted via two fibers of 25 km. The wave packets are relatively delayed and recombined on a second beam splitter, forming a large Mach-Zehnder interferometer. Coincidence counts between the photons at the two output modes are registered. The main challenge consists in the trade-off between low count rates due to narrow filtering and length fluctuations of the 25-km-long arms during the measurement. For balanced paths a Hong-Ou-Mandel dip with a net visibility of 47.3% is observed, which is close to the maximal theoretical value of 50% developed here. This proves the practicability of a long-distance Bell-state measurement with two independent sources, as, e.g., required in an entanglement swapping configuration in the scale of tens of kilometers.},
doi = {10.1103/PhysRevA.71.042335},
url = {https://www.osti.gov/biblio/20653292}, journal = {Physical Review. A},
issn = {1050-2947},
number = 4,
volume = 71,
place = {United States},
year = {2005},
month = {4}
}